/* Determines whether the following stroke could be interpreted as
* an edge (or edges) and if so, returns all the consecutive nodes that the
* stroke has gone through in order.
*/
public static Nodes ifEdgeGetNodes(Stroke s, Graph g)
{
Point[] sPoints = s.GetPoints();
Nodes strokeHitNodes = new Nodes();
Node prev = null;
for (int i = 0; i < sPoints.Length; i++)
{
for (int j = 0; j < g.Nodes.Length(); j++)
{
Node n = g.Nodes[j];
Rectangle r = n.Stroke.GetBoundingBox();
if (s.HitTest(n.CenterPoint, Math.Max(r.Width / 2, r.Height / 2)) && r.Contains(sPoints[i]) && !n.Equals(prev))
{
strokeHitNodes.Add(n);
prev = n;
break;
}
}
}
//If stroke hit one or less nodes, it is clearly not an edge.
if (strokeHitNodes.Length() < 2)
{
return(null);
}
return(strokeHitNodes);
}
private void inkOverlay_SelectionResized(object sender, InkOverlaySelectionResizedEventArgs e)
{
if (this.InvokeRequired)
{
return;
}
Nodes selectedNodes = graph.Nodes.getNodes(inkOverlay.Selection);
for (int i = 0; i < selectedNodes.Length(); i++)
{
Rectangle r = selectedNodes[i].Stroke.GetBoundingBox();
selectedNodes[i].CenterPoint = new Point(r.X + r.Width / 2, r.Y + r.Height / 2);
}
Invalidate();
}
//Renders each edge and node and also marks the home and destination nodes
public void Render(InkOverlay i, Graphics g)
{
for (int j = 0; j < edges.Length(); j++)
{
edges[j].Render(i, g);
}
for (int j = 0; j < nodes.Length(); j++)
{
nodes[j].Render(i, g);
if (nodes[j].Equals(home))
{
g.DrawString("*", new Font("Arial", 30), new SolidBrush(Color.Green), StrokeManager.InkSpaceToPixelRect(i, g, nodes[j].Stroke.GetBoundingBox()));
}
else if (nodes[j].Equals(destination))
{
g.DrawString("X", new Font("Arial", 14, FontStyle.Bold), new SolidBrush(Color.Red), StrokeManager.InkSpaceToPixelRect(i, g, nodes[j].Stroke.GetBoundingBox()));
}
}
}
private void inkOverlay_Stroke(object sender, InkCollectorStrokeEventArgs e)
{
if (this.InvokeRequired)
{
return;
}
//in effect, this is reseting the timer to start from the beginning.
edgeTimer.Stop();
edgeTimer.Start();
//Check if the stroke was a tap, and if it was, get the node it tapped.
Node n = StrokeManager.TappedNode(e.Stroke, graph);
if (n != null)
{
//If its eraser mode, delete it.
if (inkOverlay.EditingMode == InkOverlayEditingMode.Delete)
{
graph.Remove(n);
}
else
{
//Any other mode, select it and change to selection mode
int[] ids = { n.Stroke.Id };
selectionButton(sender, e);
inkOverlay.Selection = e.Stroke.Ink.CreateStrokes(ids);
}
e.Stroke.Ink.DeleteStroke(e.Stroke);
Invalidate();
return;
}
//The following code is for pen mode only strokes
if (inkOverlay.EditingMode != InkOverlayEditingMode.Ink)
{
return;
}
//If a stroke is inside a node, store it in n
n = StrokeManager.HitNodeTest(e.Stroke, graph);
//If the stroke is closed and it's a start, assign a home or destination
if (StrokeManager.isClosed(e.Stroke) && n != null && StrokeManager.isStar(e.Stroke))
{
graph.AssignNode(n);
RecognizeWeight(); //Attempt at recognizing weight is made after every stroke.
}
//If the stroke is closed and it is not enclosed in a node and is a circle, make a circular node
else if (StrokeManager.isClosed(e.Stroke) && n == null && e.Stroke.PacketCount > StrokeManager.SMALLEST_N_SIZE && StrokeManager.FitsCircleProperties(e.Stroke))
{
Stroke circle = StrokeManager.makeCircle(inkOverlay, e.Stroke);
Node circleNode = new Node(circle);
graph.Add(circleNode);
RecognizeWeight();
}
//If the stroke is close and it is not enclosed in a node and is a rectangle, make a rectangular node
else if (StrokeManager.isClosed(e.Stroke) && n == null && e.Stroke.PacketCount > StrokeManager.SMALLEST_N_SIZE && StrokeManager.FitsRectProperties(e.Stroke))
{
Stroke rect = StrokeManager.makeRect(inkOverlay, e.Stroke);
Node rectNode = new Node(rect);
graph.Add(rectNode);
RecognizeWeight();
}
//if the stroke isn't closed, then it is an edge.
else if (!StrokeManager.isClosed(e.Stroke))
{
//Get all the nodes hit by this stroke and create edges for them
Nodes edgeNodes = StrokeManager.ifEdgeGetNodes(e.Stroke, graph);
if (edgeNodes != null && !StrokeManager.isScratchOut(e.Stroke))
{
for (int i = 0; i < edgeNodes.Length() - 1; i++)
{
if (!Edge.hasEdge(edgeNodes[i], edgeNodes[i + 1]))
{
Edge edge = new Edge(edgeNodes[i], edgeNodes[i + 1], inkOverlay);
graph.Add(edge);
}
}
}
else if (StrokeManager.isScratchOut(e.Stroke))
{
ArrayList objs = StrokeManager.HitObjects(e.Stroke, graph);
for (int i = 0; i < objs.Count; i++)
{
graph.Remove(objs[i]);
}
}
RecognizeWeight();
}
else
{
//if all of the above fails, then the stroke is considered for edge weights
Edge hitEdge = StrokeManager.HitEdgeTest(e.Stroke, graph);
if (hitEdge != null)
{
/* if the edge hit is the same as the previous one,
* accumulate strokes for it before recognizing,
* if it's a different edge, then recognize and add this
* stroke to the new edge.
*/
if (prevEdgeHit == null)
{
prevEdgeHit = hitEdge;
}
if (hitEdge.Equals(prevEdgeHit))
{
myRecognizer.Strokes.Add(StrokeManager.CopyStroke(e.Stroke));
}
else
{
RecognizeWeight();
prevEdgeHit = hitEdge;
myRecognizer.Strokes.Add(StrokeManager.CopyStroke(e.Stroke));
}
}
}
e.Stroke.Ink.DeleteStroke(e.Stroke);
Invalidate();
}
/* Determines whether the following stroke could be interpreted as
* an edge (or edges) and if so, returns all the consecutive nodes that the
* stroke has gone through in order.
*/
public static Nodes ifEdgeGetNodes(Stroke s, Graph g)
{
Point[] sPoints = s.GetPoints();
Nodes strokeHitNodes = new Nodes();
Node prev = null;
for(int i=0; i<sPoints.Length; i++)
{
for(int j=0; j<g.Nodes.Length(); j++)
{
Node n = g.Nodes[j];
Rectangle r = n.Stroke.GetBoundingBox();
if(s.HitTest(n.CenterPoint,Math.Max(r.Width/2, r.Height/2)) && r.Contains(sPoints[i]) && !n.Equals(prev))
{
strokeHitNodes.Add(n);
prev = n;
break;
}
}
}
//If stroke hit one or less nodes, it is clearly not an edge.
if(strokeHitNodes.Length() < 2)
{
return null;
}
return strokeHitNodes;
}